Vitis 'Concord Blue'
The skin of a Concord grape is typically dark blue or purple, and often is covered with a lighter colored "bloom" which can be rubbed off. It is a slip-skin variety, meaning that the skin is easily separated from the fruit.
Although vines often are allowed to grow at random, sprawling over the ground during the first season, it's best to train the stronger of the two canes that develop from the plant to a strong stake, five to six feet tall. Remove any suckers growing from the base of the canes.